/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
*/
#ifndef __ASM_ARC_PTRACE_H
#define __ASM_ARC_PTRACE_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
/* THE pt_regs: Defines how regs are saved during entry into kernel */
struct pt_regs {
/*
* 1 word gutter after reg-file has been saved
* Technically not needed, Since SP always points to a "full" location
* (vs. "empty"). But pt_regs is shared with tools....
*/
long res;
/* Real registers */
long bta; /* bta_l1, bta_l2, erbta */
long lp_start;
long lp_end;
long lp_count;
long status32; /* status32_l1, status32_l2, erstatus */
long ret; /* ilink1, ilink2 or eret */
long blink;
long fp;
long r26; /* gp */
long r12;
long r11;
long r10;
long r9;
long r8;
long r7;
long r6;
long r5;
long r4;
long r3;
long r2;
long r1;
long r0;
long sp; /* user/kernel sp depending on where we came from */
long orig_r0;
/*to distinguish bet excp, syscall, irq */
union {
#ifdef CONFIG_CPU_BIG_ENDIAN
/* so that assembly code is same for LE/BE */
unsigned long orig_r8:16, event:16;
#else
unsigned long event:16, orig_r8:16;
#endif
long orig_r8_word;
};
};
/* Callee saved registers - need to be saved only when you are scheduled out */
struct callee_regs {
long res; /* Again this is not needed */
long r25;
long r24;
long r23;
long r22;
long r21;
long r20;
long r19;
long r18;
long r17;
long r16;
long r15;
long r14;
long r13;
};
#define instruction_pointer(regs) ((regs)->ret)
#define profile_pc(regs) instruction_pointer(regs)
/* return 1 if user mode or 0 if kernel mode */
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
#define user_stack_pointer(regs)\
({ unsigned int sp; \
if (user_mode(regs)) \
sp = (regs)->sp;\
else \
sp = -1; \
sp; \
})
/* return 1 if PC in delay slot */
#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
#define in_syscall(regs) (regs->event & orig_r8_IS_SCALL)
#define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT)
#define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED)
#define syscall_restartable(regs) !(regs->event & orig_r8_IS_SCALL_RESTARTED)
#define current_pt_regs() \
({ \
/* open-coded current_thread_info() */ \
register unsigned long sp asm ("sp"); \
unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
(struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1; \
})
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->r0;
}
#endif /* !__ASSEMBLY__ */
#define orig_r8_IS_SCALL 0x0001
#define orig_r8_IS_SCALL_RESTARTED 0x0002
#define orig_r8_IS_BRKPT 0x0004
#define orig_r8_IS_EXCPN 0x0004
#define orig_r8_IS_IRQ1 0x0010
#define orig_r8_IS_IRQ2 0x0020
#endif /* __KERNEL__ */
#ifndef __ASSEMBLY__
/*
* Userspace ABI: Register state needed by
* -ptrace (gdbserver)
* -sigcontext (SA_SIGNINFO signal frame)
*
* This is to decouple pt_regs from user-space ABI, to be able to change it
* w/o affecting the ABI.
* Although the layout (initial padding) is similar to pt_regs to have some
* optimizations when copying pt_regs to/from user_regs_struct.
*
* Also, sigcontext only care about the scratch regs as that is what we really
* save/restore for signal handling.
*/
struct user_regs_struct {
struct scratch {
long pad;
long bta, lp_start, lp_end, lp_count;
long status32, ret, blink, fp, gp;
long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
long sp;
} scratch;
struct callee {
long pad;
long r25, r24, r23, r22, r21, r20;
long r19, r18, r17, r16, r15, r14, r13;
} callee;
long efa; /* break pt addr, for break points in delay slots */
long stop_pc; /* give dbg stop_pc directly after checking orig_r8 */
};
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_PTRACE_H */
